6L80 valve body for 2006-2017, remanufactured and ready to install. Ships fast from the USA.
This is the Sonnax Zip Kit, part number 6L45-6L90-ZIP, for the GM 6L45, 6L50, 6L80 and 6L90. It is not a complete valve body. It is the set of drop-in parts a rebuilder installs in your own valve body, pump and center support to stop the pressure leaks behind the usual 6L80 complaints in Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro and Corvette applications: slips and flares, soft or delayed engagement, burnt clutches and torque converter clutch codes.
The 6L80 is a clutch-to-clutch six-speed. Solenoids in the control module send signal pressure to clutch regulator valves in the valve body, and those valves meter apply oil to each clutch. Over time the aluminum bores wear, end plugs start leaking and checkballs stop sealing, so the pressure the computer commands is not the pressure the clutch gets. Sonnax designed this kit to seal the main line, clutch apply control, solenoid feed and lockup control circuits. According to Sonnax, the kit contains:
The parts are drop-in, so no reaming or special tools are needed, and a technical booklet with vacuum test locations comes in the box.
Check fluid level with the proper hot procedure, then scan for codes and watch commanded versus actual gear ratios. Many 6L80 pressure complaints are hydraulic, so swapping the control module rarely cures them. Vacuum testing the valve body bores tells you which circuits leak and whether drop-in parts are enough or the casting needs a reamed repair. Our 6L80 valve body testing guide covers that step by step, and the 6L80 common problems guide sorts out the converter shudder and clutch wear issues that look similar.
Listed for 2006-2017 GM vehicles with the 6L80, and Sonnax builds the same kit for the 6L45, 6L50 and 6L90. Because you rebuild the valve body already in your transmission, you avoid the mismatch GM describes in bulletin 16-NA-130, where installing the wrong upper valve body causes no reverse or no second. Some pieces, like the pressure regulator valve and center support seals, sit outside the valve body, so the full kit fits best into a teardown. See every part for this unit on the 6L80 parts page, and send us your year and VIN if you want a second check.
Follow the one-page Sonnax quick guide and the booklet, vacuum test each bore before and after, and keep valves in order on the bench. Clean the valve body thoroughly, torque bolts in sequence, and fill with Dexron VI; a gallon of Dexron VI full synthetic ATF is a sensible add. Because the pressure regulator lives in the pump, inspect the 6L80 pump while it is apart. After assembly, reset adaptive values and run the fast learn with a capable scan tool so the module relearns clutch fill times.
| Transmission | 6L80 |
| Year Range | 2006-2017 |
| Condition | Remanufactured / updated |
| Shipping | Ships from the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is a repair kit of drop-in valves, sleeves, springs, end plugs, checkballs and seals that you install in your existing 6L80 valve body, pump and center support.
No. Sonnax designs the Zip Kit parts as drop-ins. A vacuum test setup is strongly recommended to confirm each bore seals.
It addresses TCC regulator and lockup circuit leaks. Shudder caused by worn fluid or a damaged converter needs a fluid exchange or converter work instead.
Yes. The 6L45-6L90-ZIP kit is listed for the 6L45, 6L50, 6L80 and 6L90.
Yes. Clear adaptive values and run the fast learn procedure with a scan tool so the control module relearns clutch apply after the hydraulic changes.
